Differentiate between spontaneous and stimulated emission.
|Sr.no.||Spontaneous emission||Stimulated emission|
|1.||When an atom in an excited state makes a transition into ground state by emission of photon, without any external stimulus, it’s called spontaneous emission.||When an atom in an higher energy state is forced by a photon to make a transition into ground state resulting into emission of another photon is called stimulated emission.|
|2.||It is not useful for LASER.||It is useful for LASER.|
|3.||Spontaneous emission does not require an external electromagnetic stimulus to release energy||Stimulated emission does require external electromagnetic stimuli to release energy.|
|4.||The probability of spontaneous emission to take place is higher than the probability for stimulated emission to take place||The probability of stimulated emission to take place is higher than the probability for spontaneous emission to take place|
Concept: Spontaneous Emission and Stimulated Emission
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